Additional Inspections

WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

Visually and physically check the vacuum hoses for splits, kinks, and proper connections and routing as shown on the Vehicle Emission Control Information label.
Check the intake manifold and the exhaust manifold passages for casting flash.
Check the exhaust system for damaged or collapsed pipes. Check mufflers for heat distress or possible internal failure. Check the catalytic converter for plugged condition. Go to RESTRICTED EXHAUST .
Electromagnetic Interference (EMI) on the reference circuit can cause an engine miss condition. A scan tool can usually detect EMI by monitoring the engine RPM. A sudden increase in RPM with little change in actual engine RPM change may indicate that EMI is present. If a problem exists, check for high voltage components near the ignition control circuits.